Phase 1: Longer warmup plus 2 low (2%) hills.
Phase 2: medium hill (5%) flows into a 10% hill
Phase 3: intervals and sprints
-Phase 4 steady state flows into cooldown
This workout is ~54 min. long.
I like the fact that Grace's 60 min. workouts are in phases. I don't think I'd enjoy iTread or my treadmill if I just stayed at one technique of workout. It makes the workout more enjoyable and there's enough recovery time to gear back up.
Upbeat,encouraging, and wants to challenge you and she does! "There's nothing your body can't do when you put your mind to it."